This chart is skewed due to the mechanics in MSV. There's a large percentage of AoE/Cleave fights compared to a normal raid. Just off the top of my head, Stone Guard (cleave), Feng (mild AoE), Gara'jal (Cleave/AoE), Elegon (mild AoE), and Will of the Emperor (AoE). This instance was basically designed with cleave/multi-dot classes in mind.